<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>js-string</title>
		<script>
			let s=String.fromCharCode(65,66,67,21016);
			alert(s);
			let s1="nihao,woshizhazhahui";
			alert(s1.length);
			alert(s1[2]+">>>>>>>>>>>?");
			s1=s1.toUpperCase();
			alert(s1);
			let ar=s1.split("A");
			alert(ar.length);
		</script>
	</head>
	<body>
	</body>
</html>